I did this on my flight from London yesterday! More audiobook rather but still. And it was real comfy as we got a first class upgrade as compensation for the airline repeatedly screwing up our flight. (Sold tickets to a full flight, wouldn’t let us check in when we got a real flight, had to wait two days with issues, etc)
American. It honestly wasn't too bad since we were staying with my family over there so it's not like we had to deal with hotels or something. Honestly loved the free first class. Just cost us maybe 1 hour of annoyance with the airline since they thankfully notified us about the overbooking issue and gave us the solution before we had left for the airport. So it’s not like we got there 𝘵𝘩𝘦𝘯 found out.